System and method for use of a switched mode TCXO for...

Details System and method for use of a switched mode TCXO for... System and method for use of a switched mode TCXO for...

2011-04-19

2011-04-19

Mis, David (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S066000, C331S176000, C331S179000, C455S258000

Reexamination Certificate

active

07928811

ABSTRACT:
Systems and methods are disclosed herein for using a switched mode TCXO or VC-TCXO in a satellite navigation receiver where the switched mode TCXO or VC-TCXO may operate either in an active compensation mode to compensate for temperature induced frequency error or in a second fixed compensation mode where the TCXO or VC-TCXO is not compensated for temperature. The switched mode TCXO or VC-TCXO is operated in the active compensation mode when satellite acquisition performance may be improved from a reduction in the range of oscillator frequency error. The switched mode TCXO or VC-TCXO may be switched to operate in the fixed compensation mode when satellite tracking performance is sensitive to discontinuities in the phase, frequency, and/or frequency rate of the oscillator clock when temperature compensation is applied.

REFERENCES:
patent: 5204975 (1993-04-01), Shigemori
patent: 7583157 (2009-09-01), Sakurai

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